论文部分内容阅读
研究了钛含量为0.67%~1.82%的Fe-C-B-Ti合金在铸态和热处理下微观组织、硬度和冲击韧性的变化规律。结果表明:当钛含量为0.67%时,Fe-C-B-Ti铸态合金组织由马氏体、珠光体和网状的共晶硼化物组成,硬度和冲击韧性较高。随钛含量的增加,Fe-C-B-Ti合金铸态组织中的马氏体逐渐消失,出现铁素体,硬度和冲击韧性逐渐下降。热处理后,Fe-C-B-Ti合金中的共晶硼化物呈断网状,并随温度的升高有明显粗化。随淬火温度的升高,Fe-C-B-Ti合金的硬度和冲击韧性增加,在1 050℃时达到最大值,当温度超过1 500℃时,硬度和冲击韧性反而降低。
The microstructure, hardness and impact toughness of Fe-C-B-Ti alloy with 0.67% ~ 1.82% titanium content were studied under as-cast and heat treatment conditions. The results show that the Fe-C-B-Ti as-cast alloy consists of martensite, pearlite and reticular eutectic boride when the content of titanium is 0.67%, and its hardness and impact toughness are high. With the increase of titanium content, the martensite in as-cast Fe-C-B-Ti alloy gradually disappears, and the ferrite appears, and the hardness and impact toughness decrease gradually. After heat treatment, the eutectic borides in the Fe-C-B-Ti alloy show an intergranular fracture, and the coarsening of the boride is obviously roughened with the increase of the temperature. With the increase of quenching temperature, the hardness and impact toughness of Fe-C-B-Ti alloy increase and reach the maximum value at 1 050 ℃. When the temperature exceeds 1 500 ℃, the hardness and impact toughness decrease.